TWI784436B - rotating electrical machine - Google Patents

Abstract

A rotating electrical machine (1) according to an embodiment includes: a cylindrical stator (2); a rotor (3) disposed in the inner space of the stator (2); and a bottomed cylindrical case (4) for accommodating the stator ( 2); the end cover (5), which is installed on the open end (41) of one side of the housing (4); and, the circuit board (7), which controls the driving of the rotating motor (1); and, the stator (2 ) includes: a stator core (20) having a plurality of protrusions (20b) protruding toward the center of the stator (2); insulators (21, 22) mounted on the stator core (20); and a coil (23) , which is formed by winding the wire (24) to each of the plurality of protrusions (20b) through the insulator (21, 22); and the circuit board (7) is arranged on the axis of the housing (4). The outer end is closer to the inner side, and it is arranged between the stator (2) and the end cover (5). ) to insulate the circuit substrate (7) from the coil (23); Insulated from end cap (5).

Description

rotating electrical machine

The invention relates to a rotating electric machine. This application claims priority based on International Patent Application No. PCT/JP2020/014740 filed on March 31, 2020, and its content is incorporated herein.

Conventionally, an inner rotor type brushless DC motor is known as a rotary electric machine (see, for example, Patent Documents 1 and 2). For example, in Patent Document 1, a structure is disclosed in which resin is injected into a housing of a motor. Resin is filled between the stator and the housing, leaving a space in the center where the rotor can be inserted. For example, Patent Document 2 discloses a structure in which a circuit board is accommodated in a case. The casing includes: a metal cylinder mounted on the outer periphery of the stator; a resin molded part formed by molding the cylinder and the stator with resin; a metal cover connected to the front end of the cylinder; And, the cover member is attached to the base end portion of the resin molded portion. [Prior Art Literature] (patent literature)

Patent Document 1: Patent No. 3318531 Patent Document 2: Patent No. 3612715

[Problem to be solved by the invention]

However, there is room for improvement in terms of internally configuring a circuit board capable of controlling the operation of the motor and reducing the size of the motor in the axial direction.

Therefore, an object of the present invention is to reduce the size of the rotating electrical machine in the axial direction while configuring the circuit board inside. [Technical means to solve the problem]

As a solution to the above-mentioned problems, aspects of the present invention have the following configurations. (1) The rotating electric machine of the aspect of the present invention includes: a cylindrical stator; a rotor disposed in the inner space of the stator; The opening end on one side of the housing; and, a circuit board, which controls the driving of the rotating electrical machine; and, the stator is provided with: a stator core, which has a plurality of protrusions protruding toward the center of the stator; an insulator, which houses on the stator core; and, a coil formed by winding a wire to each of the plurality of protrusions via the insulator; Inside, and arranged between the stator and the end cover, the rotating electric machine further includes: a first insulating sheet arranged between the stator and the circuit board to insulate the circuit board from the coil; and, a second Two insulating sheets are disposed between the circuit substrate and the end cover to insulate the circuit substrate and the end cover.

(2) In the rotating electrical machine described in (1) above, the LOI value of each of the first insulating sheet and the second insulating sheet in an environment of 220° C. may be higher than 20.8%.

(3) In the rotating electrical machine described in (1) or (2) above, the space between the case and the insulator and between each of the plurality of protrusions of the stator core may be filled with resin. The gap enables the housing and the stator to be integrated.

(4) In the rotating electrical machine described in any one of (1) to (3) above, the insulator may have an abutment portion for abutting against the surface of the first insulating sheet on the stator side.

(5) In the rotating electric machine described in any one of (1) to (4) above, the second insulating sheet may also be clamped between the opening portion on one side of the housing and the cylinder of the end cover. between the front ends of the parts.

(6) In the rotating electric machine described in any one of (1) to (5) above, the first insulating sheet and the second insulating sheet may each be formed of amide fibers and have a diameter of 0.25 mm or more. thickness.

(7) In the rotating electrical machine described in any one of (1) to (6) above, the circuit board may include a magnetic sensor provided on the surface of the circuit board on the stator side. . (effect of invention)

According to the present invention, the circuit board can be formed inside, and the rotating electric machine can be downsized in the axial direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following description, an inner rotor type brushless DC motor as an example of a rotating electrical machine will be described as an example.

[first embodiment] ＜Rotating motor＞ As shown in FIG. 1, a rotating electric machine 1 includes a stator 2, a rotor 3, a housing 4, an end cover 5, a temperature sensor 6 (see FIG. 3), a circuit board 7, a first insulating sheet 8, a second insulating Sheet 9 and resin sheet 10. In this embodiment, a stator unit is configured by providing the stator 2 on the housing 4 . Moreover, the stator unit assembly is constituted by providing the temperature sensor 6 and the circuit board 7 on the stator unit.

In Fig. 1, reference numeral 12 denotes a bearing that rotatably supports the shaft 11. The bearings 12 are respectively disposed on the housing 4 and the end cover 5 . The shaft 11 of the electric rotating machine 1 is rotatably supported by the housing 4 and the end cover 5 via a bearing 12 . Hereinafter, the direction along the axis CL of the shaft 11 is defined as the "axial direction", the direction perpendicular to the axis CL is defined as the "radial direction", and the direction around the axis CL is defined as the "circumferential direction".

＜Stator＞ The stator 2 has a cylindrical shape (tubular shape). The stator 2 includes a stator core 20 , insulators 21 and 22 , and a coil 23 .

For example, the stator core 20 is formed by laminating a plurality of iron thin plates (electrical steel sheets) in the axial direction. The stator core 20 has a ring shape coaxial with the axis line CL. The stator core 20 is fixed to the inner peripheral surface of the housing 4 .

As shown in Fig. 9, the stator core 20 is provided with: an annular core body 20a; It protrudes toward the center (the center of the stator 2 ) with a predetermined length, and is formed with a predetermined length in the axial direction along the inner peripheral surface of the core main body 20 a. The protrusion part 20b is equipped with the protrusion flange part 20d extended in the circumferential direction from the protrusion end part 20c which is the radial inner end part. In the present embodiment, the protruding flange portion 20d extends with substantially the same length on both sides in the circumferential direction with the protruding end portion 20c as a boundary. The nine protrusions 20b are arranged at substantially the same intervals in the circumferential direction. In the present embodiment, the nine protrusions 20 b are arranged at intervals of approximately 40 degrees (central angle) in the circumferential direction. The protrusion flange part 20d provided in each protrusion part 20b is arrange|positioned at intervals in the circumferential direction, respectively. The stator core 20 has a space 91 surrounded by the protruding end portions 20c of the respective protruding portions 20b.

＜Insulator＞ As shown in FIG. 1 , insulators 21 and 22 are mounted on stator core 20 . The insulators 21, 22 can be split axially (cf. Fig. 5). The insulators 21 and 22 are mounted on the inner peripheral portion of the core main body 20 a (see FIG. 9 ). Insulators 21 and 22 are mounted on both axial sides of stator core 20 . The insulators 21 and 22 are composed of a first insulator 21 mounted on one axial side of the stator core 20 and a second insulator 22 mounted on the other axial side of the stator core 20 . In this embodiment, the insulators 21 and 22 are formed by combining the first insulator 21 and the second insulator 22 .

The coil 23 is formed by winding a winding wire 24 around a plurality of protrusions 20 b (see FIG. 9 ) respectively via insulators 21 and 22 . As shown in FIG. 3 , the coil 23 is composed of three sets of a plurality of coils 23U, 23V, and 23W of different phases (for example, U-phase, V-phase, and W-phase). Coils 23U, 23V, and 23W of U-phase, V-phase, and W-phase are arranged in order along the circumferential direction of stator core 20 . The coils 23 adjacent to each other in the circumferential direction are arranged at intervals. In the present embodiment, the nine coils 23 are arranged at intervals of approximately 40 degrees (central angle) in the circumferential direction. That is, the three sets of coils 23U, 23V, and 23W are arranged at intervals of approximately 120 degrees (central angle) in the circumferential direction. As shown in FIG. 4, the coil 23 has a bent portion 24a formed by bending the winding wire 24 at both ends in the axial direction. The bent portions 24a are respectively provided on both axial sides of the winding wire 24 of the coil 23 adjacent in the circumferential direction. The bent portions 24 a are provided on both axial sides of the winding wires 24 of the U-phase, V-phase, and W-phase coils 23U, 23V, and 23W, respectively.

＜Rotor＞ As shown in FIG. 1 , the rotor 3 is arranged in the space 91 (inner space) of the stator 2 . The rotor 3 is disposed radially inside the stator 2 at a distance from the stator 2 . The rotor 3 is fixed to the shaft 11 . The rotor 3 is rotatable about the axis CL integrally with the shaft 11 . The rotor 3 includes a yoke 30 and a magnet 31 .

For example, the yoke 30 is formed of a metal material such as aluminum. The yoke 30 has a ring shape coaxial with the axis CL. For example, the inner peripheral surface of the yoke 30 is fixed to the outer peripheral surface of the shaft 11 with an adhesive. For example, the magnet 31 is a permanent magnet. The magnet 31 has a ring shape coaxial with the axis CL. The magnet 31 is fixed to the yoke 30 by inserting the yoke 30 into an insertion hole provided on the magnet 31 . Accordingly, the magnet 31 can rotate integrally with the yoke 30 and the shaft 11 . Furthermore, the magnet 31 has a plurality of magnetic poles of N-S poles at a portion facing the inner peripheral surface of the stator 2 . A plurality of magnetic poles of N-S poles are arranged alternately in the circumferential direction.

＜Shell＞ The housing 4 has a bottomed cylindrical shape (bottomed cylindrical shape) capable of accommodating the stator 2 . The housing 4 (bottomed cylindrical housing) has an open end 41 on one axial side of the housing 4 . The housing 4 has a bottom 42 on the other axial side of the housing 4 . For example, the casing 4 is made of metal such as aluminum.

The casing 4 includes: a cylindrical cylindrical portion 40 (hereinafter, also referred to as “the casing cylindrical portion 40 ”) extending in the axial direction; and a bottom portion 42 connected to the axial direction of the casing cylindrical portion 40 . the other side of the The casing cylindrical portion 40 and the bottom portion 42 are integrally formed of the same member. For example, the bottom portion 42 of the housing 4 is attached to an attachment member 101 formed of a metal plate such as aluminum (see FIG. 1 ). The other surface of the casing 4 becomes the mounting surface, and can be mounted on the mounting member 101 . The bottom 42 of the housing 4 has a communication hole in the center that communicates one side with the other. The bottom 42 of the housing 4 has a bearing mounting portion to mount the bearing 12 . The hole and communication hole of the bearing 12 mounted on the bearing loading portion communicate with each other.

As shown in FIG. 2 , the housing 4 has a stepped portion 43 on one axial side of the housing cylindrical portion 40 . The step portion 43 has: an annular surface 43a (hereinafter, also referred to as "housing-side annular surface 43a"), which is annular when viewed from the axial direction; and a peripheral surface 43b (hereinafter, also referred to as "shell side annular surface 43a"). The body-side peripheral surface 43b") extends from the outer peripheral edge of the casing-side annular surface 43a to one side in the axial direction. The axial length of the case side peripheral surface 43b is larger than the radial length of the case side annular surface 43a.

＜End cap＞ As shown in FIG. 1 , the end cover 5 is attached to an open end 41 on one axial side of the housing 4 . For example, the end cap 5 is made of metal such as aluminum. The end cap 5 includes: a cylindrical cylindrical portion 50 (hereinafter, also referred to as “housing cylindrical portion 50 ”) extending in the axial direction; side. The axial length of the housing cylindrical portion 50 is smaller than the axial length of the housing cylindrical portion 40 . The cover cylindrical portion 50 and the cover portion 51 are integrally formed of the same member. The cover portion 51 of the end cover 5 has a bearing mounting portion at the center portion on the housing 4 side to mount the bearing 12 .

As shown in FIG. 2 , the end cap 5 has a convex portion 52 that rises from the other side in the axial direction of the housing cylindrical portion 50 to the other side in the axial direction. The convex portion 52 has: an annular surface 52a (hereinafter, also referred to as "housing side annular surface 52a"), which is annular when viewed from the axial direction; and a peripheral surface 52b (hereinafter, also referred to as "housing side peripheral surface 52a"). surface 52b") extending from the outer peripheral edge of the housing-side annular surface 52a toward one side in the axial direction. The radial length of the housing-side annular surface 52a is greater than the radial length of the case-side annular surface 43a. The axial length of the housing side peripheral surface 52b is smaller than the axial length of the housing side peripheral surface 43b. The axial length of the housing side peripheral surface 52b is larger than the radial length of the housing side annular surface 52a.

The end cap 5 is attached to the opening end 41 of one side of the housing 4 by fitting the convex portion 52 of the housing cylindrical portion 50 into the stepped portion 43 of the housing cylindrical portion 40 . The cover side peripheral surface 52b is in contact with the case side peripheral surface 43b. The housing-side annular surface 52a is separated from the case-side annular surface 43a in the axial direction.

＜Temperature sensor＞ For example, the temperature sensor 6 is a positive temperature coefficient (Positive Temperature Coefficient, PTC) thermistor. The temperature sensor 6 is provided on the end cover 5 side of the stator 2 . The temperature sensor 6 has a function of rapidly increasing the resistance value when the temperature exceeds a certain level. Each of the temperature sensors 6 is electrically connected to a power supply for driving a motor and a circuit board 7 (not shown). For example, when the temperature near the temperature sensor 6 exceeds a certain value, the resistance value of the temperature sensor 6 is increased to stop the power supply to the circuit board 7 .

As shown in FIG. 4 , the temperature sensor 6 is arranged between the bent portions 24 a of the winding wire 24 in the adjacent coils 23 . The temperature sensor 6 is in contact with the bent portion 24 a of the winding wire 24 . The temperature sensor 6 is in contact with the bent portion 24 a of the respective winding wire 24 of two adjacent coils 23 (adjacent coils 23V, 23W in this embodiment) in the circumferential direction. In this embodiment, only one temperature sensor 6 is provided. In this embodiment, the temperature sensor 6 is arranged between the bent portion 24a of the winding wire 24 in the V-phase coil 23V and the W-phase coil 23W adjacent to each other in the circumferential direction.

For example, the temperature sensors 6 are each brought into contact with the bent portion 24a of the adjacent winding wire 24 by using a jig not shown. In this state, resin is filled around the contact portion between the bent portion 24a of the winding wire 24 and the temperature sensor 6 by a filling device not shown. Thereby, the state where the temperature sensor 6 is in contact with the bent portion 24a of the winding wire 24 can be maintained.

＜Circuit board＞ The circuit board 7 controls the driving of the rotary electric machine 1 . As shown in FIG. 1 , the circuit board 7 is disposed inside the case 4 inside the axially outer end of the case 4 . The circuit board 7 is supported by a contact portion 82 , which will be described later, protruding upward from the upper surface of the first insulator 21 . The circuit board 7 is arranged at a predetermined distance from the upper surface of the first insulator 21 by the contact portion 82 . The circuit board 7 is arranged between the stator 2 and the end cover 5 . The circuit board 7 is disposed on the inner side in the axial direction of the opening end 41 on one side of the housing 4 . The circuit board 7 is disposed slightly inward in the axial direction from the case-side annular surface 43 a (see FIG. 2 ). The circuit board 7 is fixed to the inner peripheral surface of the casing 4 .

As shown in FIG. 7A, the circuit board 7 includes: a circular substrate body 70 when viewed from above; a resistor 75 for detecting the current supplied to the coil 23 (refer to FIG. 1 ); Transistors (Field Effect Transistor, FET) 76A-76C; encoder 78 for detecting the rotation angle of shaft 11 (refer to FIG. 1 ); various electronic parts 79; and IC 102 for motor controller.

The motor controller IC 102 generates current in each phase of the U-phase, V-phase, and W-phase coils 23U, 23V, and 23W by selectively turning on and off the respective FETs 76A to 76C in a specific order. FIG. 7B is a plan view of the surface (rear surface) of the circuit board 7 opposite to that of FIG. 7A . As shown in FIG. 7B , the circuit board 7 includes magnetic sensors 77A to 77C for detecting the magnetic state (the magnitude and direction of the magnetic field) of the magnet 31 .

The substrate main body 70 has: a shaft hole 71 coaxial with the axis CL; engaging portions 72A to 72C (substrate-side engaging portions) engaging with the first insulator 21; a connection hole 73 for the cable 100 (see 1 ) electrical connection; and, cutouts 74A-74C, which allow the lead wires 25A-25C of the coil 23 (refer to FIG. 3 ) to pass through.

The shaft hole 71 has a circular shape when viewed from above. The diameter of the shaft hole 71 is larger than the outer diameter of the shaft 11 . The circuit board 7 is spaced apart from the shaft 11 and arranged radially outside of the shaft 11 (see FIG. 1 ).

The engaging portions 72A to 72C have a long hole shape extending in the circumferential direction in a plan view. A plurality of engaging portions 72A to 72C are provided at intervals in the circumferential direction (for example, three in the present embodiment). The three engaging portions 72A to 72C (the first engaging portion 72A, the second engaging portion 72B, and the third engaging portion 72C) are arranged at approximately the same intervals in the circumferential direction.

The connecting hole 73 has a circular shape when viewed from above. A plurality of connection holes 73 are provided at intervals in the circumferential direction (for example, eight in the present embodiment). The eight connecting holes 73 are arranged between the first engaging portion 72A and the third engaging portion 72C in the circumferential direction.

The cutouts 74A to 74C have a concave shape opening radially outward of the circuit board 7 in a plan view. A plurality of notches 74A to 74C are provided at intervals in the circumferential direction (for example, three in the present embodiment). The three cutouts 74A to 74C (the first cutout 74A, the second cutout 74B, and the third cutout 74C) are arranged between the second engaging portion 72B and the third engaging portion 72C in the circumferential direction.

For example, resistor 75 is a shunt resistor. In this embodiment, only one resistor 75 is provided. The resistor 75 is provided on the surface of the board main body 70 (circuit board 7 ) on the side of the end cap 5 . That is, the resistor 75 is provided on the surface of the substrate main body 70 opposite to the surface on the stator 2 side.

A plurality of FETs 76A to 76C are provided at intervals in the circumferential direction (for example, three in the present embodiment). The FETs 76A to 76C are provided on the surface of the substrate main body 70 on the side of the end cap 5 . That is, the FETs 76A to 76C are provided on the surface of the substrate main body 70 on the same side as the resistor 75 .

The three FETs 76A to 76C (the first FET 76A, the second FET 76B, and the third FET 76C) are disposed near the three cutouts 74A to 74C (the first cutout 74A, the second cutout 74B, and the third cutout 74C), respectively. Between the three FETs 76A to 76C and the three notches 74A to 74C, areas 26A to 26C for soldering the lead wires 25A to 25C (refer to FIG. 3 ) of the coil 23 are provided.

Regions 26A to 26C are arranged in the vicinity of lead lines 25A to 25C of coil 23 . Thereby, the lead wires 25A to 25C of the coil 23 can be suppressed from being too long, and the generation of noise can be suppressed. The FETs 76A to 76C are electrically connected to the lead lines 25A to 25C of the coil 23 . For example, after the lead wires 25A to 25C of the coil 23 are soldered in the regions 26A to 26C, they are electrically connected to the FETs 76A to 76C through wiring formed on the circuit board 7 . By arranging the FETs 76A to 76C in the vicinity of the regions 26A to 26C, the wiring on the circuit board 7 can be shortened and simplified.

For example, the magnetic sensors 77A to 77C are Hall elements. A plurality of magnetic sensors 77A to 77C are provided at intervals in the circumferential direction (for example, three in the present embodiment). The magnetic sensors 77A to 77C are provided on the surface of the substrate main body 70 on the stator 2 side (the surface in FIG. 7B ).

In the top view of FIG. 7B, the three magnetic sensors 77A to 77C (the first magnetic sensor 77A, the second magnetic sensor 77B and the third magnetic sensor 77C) respectively use the substrate placed on the stator side The magnetic sensor at a specific position of the main body 70 detects the change of the magnetic flux caused by the rotation of the magnet 31 . For example, the magnetic sensor can be disposed directly above the magnet 31 in plan view, and close to the magnet 31 in the axial direction. Thereby, the rotation detection sensitivity of the magnet 31 can be improved.

For example, the encoder 78 is an optical encoder using an infrared light emitting diode (IR LED) as a light emitting element. For example, the encoder 78 detects the rotation of an unillustrated detector disk (disk having a slit hole) attached to the shaft 11 to generate a light ON/OFF signal. In this embodiment, only one encoder 78 is provided. Among the electronic components provided on the circuit board 7, the encoder 78 has the largest installation area. The encoder 78 is provided on the end cover 5 side of the board main body 70 .

As shown in FIG. 8 , the encoder 78 is arranged between the first FET 76A located on the far left among the three FETs 76A to 76C and the resistor 75 in plan view. That is, the encoder 78 is disposed between the first FET 76A and the resistor 75 in the circumferential direction. In this embodiment, the resistor 75 is disposed on the side opposite to the second FET 76B with the shaft hole 71 interposed therebetween in plan view. In addition, in FIG. 8, the illustration of the hole, notch, etc. other than the shaft hole 71 of the board|substrate main body 70 is abbreviate|omitted.

＜The first insulating sheet＞ As shown in FIG. 1 , the first insulating sheet 8 is arranged between the stator 2 and the circuit board 7 and between the rotor 3 and the circuit board 7 . The first insulating sheet 8 insulates at least the circuit board 7 and the coil 23 . The first insulating sheet 8 has an annular shape when viewed from the axial direction. The first insulating sheet 8 has an inner peripheral portion at the center, and the inner peripheral portion forms an insertion hole through which the shaft 11 can be inserted. The inner peripheral portion of the first insulating sheet 8 is disposed radially outside of the shaft 11 at a distance from the shaft 11 . Thereby, the first insulating sheet 8 allows the rotation of the shaft 11 . The first insulating sheet 8 is supported by a first insulator 21 . Specifically, the first insulating sheet 8 is supported by a plurality of contact portions 81 described below provided on the first insulator 21 .

＜Second insulating sheet＞ The second insulating sheet 9 is disposed between the circuit substrate 7 and the end cover 5 . The second insulating sheet 9 is disposed adjacent to the circuit board 7 . The second insulating sheet 9 at least insulates the circuit substrate 7 from the end cover 5 . The second insulating sheet 9 has an annular shape larger than the first insulating sheet 8 when viewed from the axial direction. The second insulating sheet 9 has an inner peripheral portion at the center, and the inner peripheral portion forms an insertion hole through which the shaft 11 can be inserted. The inner peripheral portion of the second insulating sheet 9 is disposed radially outside of the shaft 11 at a distance from the shaft 11 . Thereby, the second insulating sheet 9 allows the rotation of the shaft 11 .

As shown in FIG. 2 , the second insulating sheet 9 extends radially from the inner peripheral edge to the outer peripheral edge. The outer peripheral portion of the second insulating sheet 9 is arranged in the vicinity of the case side peripheral surface 43b. The outer peripheral portion of the second insulating sheet 9 is sandwiched between the opening on one side of the case 4 and the front end of the cylindrical portion 50 of the end cap 5 . The second insulating sheet 9 is sandwiched and held by the stepped portion 43 of the casing cylindrical portion 40 and the convex portion 52 of the housing cylindrical portion 50 . The second insulating sheet 9 is in contact with the case-side annular surface 43a and the cover-side annular surface 52a. The second insulating sheet 9 is only slightly away from the casing side peripheral surface 43b. The second insulating sheet 9 is only slightly separated from the surface of the circuit board 7 on the side of the end cover 5 in the axial direction. By providing a gap between the surface of the circuit board 7 on the side of the end cap 5 and the second insulating sheet 9 , higher insulation between the circuit board 7 and the end cap 5 is ensured.

<Characteristics of the first insulating sheet and the second insulating sheet> The first insulating sheet 8 and the second insulating sheet 9 are sheets having both insulating properties and flame retardancy. The first insulating sheet 8 and the second insulating sheet 9 are each formed of aramid fiber. For example, the first insulating sheet 8 and the second insulating sheet 9 are each made of insulating paper. The first insulating sheet 8 and the second insulating sheet 9 each have a thickness of 0.25 mm or more. For example, the first insulating sheet 8 and the second insulating sheet 9 each have a thickness of not less than 0.25 mm and not more than 0.35 mm.

For example, each of the first insulating sheet 8 and the second insulating sheet 9 has a thermal conductivity of 0.12 W measured at a measuring temperature of 150° C. based on ASTM (American Society for Testing and Materials) E1530. /m·K or more and 0.14 W/m·K or less.

Each of the first insulating sheet 8 and the second insulating sheet 9 has a LOI (Limiting Oxygen index) value higher than 20.8% in an environment of 220° C. Here, the LOI value is a numerical value used as a scale for measuring flame retardancy, and is specified by "JIS (Japanese Industrial Standard) K7201 Limiting Oxygen Index". For example, when each of the first insulating sheet 8 and the second insulating sheet 9 has a thickness of 0.25 mm, the LOI value in an environment of 220° C. is not less than 22% and not more than 25%.

＜Resin sheet＞ As shown in FIG. 1 , the resin sheet 10 is arranged between the bottom 42 of the case 4 and the stator 2 . The resin sheet 10 is arranged between the bottom 42 of the casing 4 and the second insulator 22 . The resin sheet 10 has an annular shape when viewed from the axial direction. The resin sheet 10 has an inner peripheral portion at the center, and the inner peripheral portion forms an insertion hole through which the shaft 11 is inserted. The inner peripheral portion of the resin sheet 10 is disposed radially outside of the shaft 11 at a distance from the shaft 11 . Thereby, the resin sheet 10 allows the rotation of the shaft 11 .

In this embodiment, in order to suppress the positional deviation of the resin sheet 10, an annular convex portion 44 is provided on the bottom 42 of the housing 4, and the annular convex portion 44 can be connected to the insertion hole of the resin sheet 10. The inner periphery of the abutment. The axial height of the annular protrusion 44 is slightly larger than the thickness of the resin sheet 10 . For example, the inner diameter of the insertion hole of the resin sheet 10 is designed according to the outer diameter of the annular protrusion 44 . Furthermore, the structure for suppressing the positional displacement of the resin sheet 10 is not limited to providing the annular convex portion 44 . For example, the outer diameter of the resin sheet 10 may match the inner diameter of the case 4 instead of providing the annular protrusion 44 . In this embodiment, the axial position of the second insulator 22 is determined by abutting against the annular protrusion 44 . Thus, the resin sheet 10 is separated from the second insulator 22 in the axial direction. However, it is not limited thereto, and the resin sheet 10 can also contact the second insulator 22 .

The resin sheet 10 is formed of silicon oxide. The resin sheet 10 has a thickness of 0.2 mm or more. For example, the resin sheet 10 has a thickness of not less than 0.2 mm and not more than 0.3 mm. For example, the thermal conductivity of the resin sheet 10 measured at a load of 20 psi by using a measuring method based on ASTM D5470 is not less than 1.0 W/m·K and not more than 1.4 W/m·K. The resin sheet 10 has V-0 in the UL (Underwriters Laboratories, Underwriters Laboratories) 94 standard, which is a standard indicating the degree of flame retardancy of the material.

＜First insulator＞ As shown in FIG. 1 , the first insulator 21 includes: an annular ring portion 80 coaxial with the stator core 20; abutting against the surface of the first insulating sheet 8 on the side of the stator 2; abutting portion 82 (hereinafter, also referred to as “substrate-side abutting portion 82 ”), which abuts against the surface of the circuit board 7 on the side of the stator 2; plural An extension part 83 (refer to FIG. 6 ), which extends toward the surface of the circuit board 7 on the stator 2 side; Each of 72A to 72C is engaged with the circuit board 7 .

The sheet-side abutting portion 81 extends from the inner peripheral side of the annular portion 80 to one side in the axial direction. The front end of the sheet-side abutting portion 81 abuts against the surface of the first insulating sheet 8 on the stator 2 side. A plurality of sheet-side abutting portions 81 are provided at intervals in the circumferential direction (for example, nine in this embodiment) (see FIG. 6 ). The nine sheet-side abutting portions 81 are arranged at approximately the same intervals in the circumferential direction (see FIG. 6 ).

The substrate-side abutting portion 82 extends from the outer peripheral side of the annular portion 80 to one side in the axial direction. The front end of the board-side contact portion 82 comes into contact with the surface of the circuit board 7 on the stator 2 side. Compared with each of the sheet-side contact portion 81 and the extension portion 83 , the substrate-side contact portion 82 extends longer toward one side in the axial direction (see FIG. 6 ). A plurality of substrate-side abutting portions 82 are provided at intervals in the circumferential direction (for example, eleven in this embodiment) (see FIG. 6 ).

As shown in FIG. 6 , the extension portion 83 extends from the outer peripheral side of the annular portion 80 to one side in the axial direction. A plurality of extending portions 83 are provided at intervals in the circumferential direction (for example, four in the present embodiment). The front end of the extension portion 83 is separated from the surface of the circuit board 7 on the stator 2 side. That is, the extension portion 83 is not in contact with the circuit board 7 . A gap is formed between the front end of the extension portion 83 and the surface of the circuit board 7 on the stator 2 side. The gap between the front end of the extension portion 83 and the circuit board 7 is used as a space for accommodating the wiring portion 1001 (refer to FIG. 2 ) of the cable 100 when electrically connecting the wiring portion 1001 to the circuit board 7 . This gap functions as an escape portion for the protruding wiring portion 1001 as described below. Specifically, the wiring portion 1001 is soldered to the circuit board 7 in a state where the wiring portion 1001 is inserted into the connection hole 73 . In this way, the wiring portion 1001 and the solder protrude from the surface of the circuit board 7 on the stator 2 side toward the stator 2 side. A gap is provided as a retreat for the protruding wiring portion 1001 .

As shown in FIG. 6 , the engaging portions 84A to 84C (insulator-side engaging portions) extend from the outer peripheral side of the annular portion 80 to one side in the axial direction. Compared with the substrate-side abutting portion 82 , the engagement portions 84A to 84C extend longer toward one side in the axial direction. The engaging portions 84A to 84C have a hook shape capable of engaging with the circuit board 7 (see FIG. 5 ). The engaging portions 84A to 84C extend from the annular portion 80 to one side in the axial direction, and then bend radially outward. Thereby, the engaging parts 84A to 84C can maintain the engaged state with the circuit board 7 .

A plurality of engaging portions 84A to 84C are provided at intervals in the circumferential direction (for example, three in the present embodiment). The three engaging portions 84A to 84C (the first engaging portion 84A, the second engaging portion 84B, and the third engaging portion 84C) are arranged at substantially the same intervals in the circumferential direction. The three engaging portions 84A to 84C (the first engaging portion 84A, the second engaging portion 84B, and the third engaging portion 84C) respectively pass through the three engaging portions 72A to 72C (the first engaging portion 72A, the second engaging portion 72A, and the third engaging portion 84C). The second engaging portion 72B and the third engaging portion 72C) are engaged with the circuit board 7 (see FIG. 5 ).

The eleven substrate-side abutting portions 82 are: five substrate-side abutting portions 82 disposed between the first engaging portion 84A and the second engaging portion 84B in the circumferential direction; five substrate-side abutting portions 82, Arranged in the circumferential direction between the second engaging portion 84B and the third engaging portion 84C; and, a substrate-side contact portion 82 is arranged in the circumferential direction between the first engaging portion 84A and the third engaging portion 84C between. The four extending portions 83 are disposed between the first engaging portion 84A and the third engaging portion 84C in the circumferential direction.

<Resin filling structure in case> As shown in FIG. 10 , the gap between the case 4 and the insulators 21 and 22 (the first insulator 21 and the second insulator 22 ) is filled with the resin 90 . Thereby, the gap between the case 4 and the insulators 21 and 22 is filled with the resin 90 . The gaps between the plurality of protrusions 20 b (see FIG. 9 ) in the stator core 20 are filled with the resin 90 . Thereby, the gap between the plurality of protrusions 20 b in the stator core 20 is filled with the resin 90 . The housing 4 , the stator 2 and the temperature sensor 6 (see FIG. 4 ) are integrated with the resin 90 .

For example, the filling step of filling the housing 4 with the resin 90 is performed in the following order. For example, the temperature sensor 6 is brought into contact with the bent portion 24 a of the coil 23 by using a jig not shown, so that the lead wire 60 of the temperature sensor 6 is exposed. Thereafter, in this state, the resin 90 is filled into the casing 4 (see FIG. 4 ). Thereby, the housing 4 , the stator 2 and the temperature sensor 6 are integrated with the resin 90 . Thereafter, the lead wire 60 is passed through a slit (not shown) in the circuit board 7 and soldered to the circuit board 7 . In this way, the wiring step of connecting the lead wires 60 to the circuit board 7 is carried out.

The resin 90 is filled in the housing 4 , leaving a space 91 in the central portion where the shaft 11 and the rotor 3 can be inserted, and filling the other gaps in the housing 4 . For example, the resin 90 is a thermosetting resin such as epoxy resin. The resin 90 is filled in the case 4 in the axial direction up to a position where the coil 23 (see FIG. 1 ) is not exposed.

For example, the thermal conductivity of the resin 90 measured at a load of 20 psi by a measuring method based on ASTM D5470 is 0.1 W/m·K or more and 0.9 W/m·K or less. The resin 90 has V-0 in the UL94 standard which is a standard indicating the degree of flame retardancy of the material. The volume resistivity of resin 90 is 1×10 ¹⁵ Ω.cm measured at 25°C by using the method based on ASTM D257, the volume resistivity at 100°C is 1×10 ¹⁵ Ω.cm, and at 150°C The volume resistivity is 3×10 ¹³ Ω.cm.

For example, the manufacturing method of the stator unit manufactured by providing the stator 2 on the case 4 and filling the case 4 with the resin 90 is performed in the following order (step). First, the resin sheet 10 is put into the casing 4 (sheet arranging step). Next, put the stator 2 into the housing 4 (stator configuration step). Next, a cylindrical molding material approximately the same size as the rotor 3 is put into the casing 4 (the first filling preparation step). For example, the molding material has a cylindrical shape, and the cylindrical shape is of such a size that the plurality of protruding end portions 20c forming the space 91 come into contact with the outer peripheral surface of the rotor 3 . The molding material is, for example, a polytetrafluoroethylene (PTFE) sheet. Next, the temperature sensor 6 in the state of being in contact with the bent portion 24a of the adjacent coil 23 is arranged between the bent portion 24a of the adjacent coil 23 using a jig not shown (second filling preparation) step). Next, the resin 90 is filled between the inner peripheral surface of the case 4 and the outer peripheral surface of the molding material by a filling device not shown (resin filling step). Next, put the housing 4 filled with the resin 90 into a vacuum chamber, vacuumize and degas to remove (degas) the air bubbles contained in the filled resin 90 (filling process step). Second, remove the mold material (filling completion step). Thereby, a space 91 into which the rotor 3 can be placed is formed in the casing 4 filled with the resin 90 .

＜Effects＞ As described above, the rotating electrical machine 1 of the above-mentioned embodiment is provided with: the cylindrical stator 2; the rotor 3 disposed in the inner space of the stator 2; The opening end 41 installed on one side of the casing 4; and, the circuit board 7, which controls the driving of the rotating electric machine 1. The stator 2 includes: a stator core 20 having a plurality of protrusions 20b protruding toward the center of the stator 2; insulators 21, 22 mounted on the stator core 20; , 22 is formed by winding each of a plurality of protrusions 20b. The circuit board 7 is disposed on the inner side of the axially outer end of the casing 4, and is disposed between the stator 2 and the end cover 5. The rotating electrical machine further includes a first insulating sheet 8 disposed between the circuit board 7 and the end cover 5. Between the stators 2, the circuit board 7 is insulated from the coil 23; According to this structure, the installation of the circuit board 7 becomes easier compared with the case where the circuit board 7 is arrange|positioned outside the case 4 (inside the end cover 5). Therefore, the rotating electrical machine 1 can be assembled efficiently. In addition, by using the first insulating sheet 8 to insulate and isolate the circuit substrate 7 from the coil 23, and using the second insulating sheet 9 to insulate the circuit substrate 7 from the end cap 5, even if the circuit substrate 7 and the coil 23 are arranged in a Even when the circuit board 7 and the end cover 5 are arranged close to each other, insulation can be ensured and safety can be improved. In addition, by separately using the first insulating sheet 8 and the second insulating sheet 9 for axial insulation, the thickness in the axial direction may be smaller than that in the case of using sealing resin (molding resin) as the insulating material, Therefore, the rotary electric machine 1 can be downsized in the axial direction. Therefore, the circuit board 7 can be formed inside, and the rotating electric machine can be downsized in the axial direction. In addition, the resin 90 is filled in the gap between the case 4 and the stator 2 arranged in the case 4, and the coil 23 of the stator 2 is covered with the resin 90, so that insulation can be ensured, and the first insulating sheet 8 can be used for Ensure higher insulation. In addition, the second insulating sheet 9 is used to insulate the circuit board 7 from the end cap 5 , so that the metal end cap 5 can be used, and electromagnetic compatibility (Electromagnetic Compatibility, EMC) can be achieved, and the heat dissipation effect can be improved.

In the above-mentioned embodiment, since the LOI value of each of the first insulating sheet 8 and the second insulating sheet 9 is higher than 20.8% in an environment of 220° C., the following effects are exhibited. Materials with an LOI value higher than 20.8% at 220° C. have heat resistance and flame retardancy. For example, even if the surrounding temperature of the coil 23 rises to 200° C., the electrical and mechanical properties are hardly affected. Thereby, even if it is used at a high temperature, the insulation between the circuit board 7 and the coil 23 , and the circuit board 7 and the end cap 5 can be ensured, and safety can be further improved.

In the above-mentioned embodiment, the resin 90 is used to fill the gaps between the case 4 and the insulators 21 and 22 of the stator 2 arranged in the case 4, and between the plurality of protrusions 20b of the stator core 20, so that the case 4 and the stator 2 are integrated, thereby exhibiting the following effects. The thermal conductivity of the heat emitted from the coil 23 of the stator 2 is improved by using the resin 90 filled in the gap in the case 4, and the generated heat is dissipated from the entire case 4, thereby suppressing the temperature rise of the rotating electrical machine 1 (coils). 23 for warming). Therefore, abnormality due to heat generation of the rotating electric machine 1 (coil 23 ) can be effectively suppressed.

In the above-described embodiment, the first insulator 21 has the sheet-side abutting portion 81 abutting on the surface of the first insulating sheet 8 on the stator 2 side, thereby exhibiting the following effects. The first insulating sheet 8 can be supported in the axial direction by the sheet-side abutting portion 81 .

In the above embodiment, the second insulating sheet 9 is sandwiched between the opening on one side of the case 4 and the front end of the cylindrical portion 50 of the end cap 5 , thereby producing the following effects. The second insulating sheet 9 can be held by the opening portion on one side of the housing 4 and the front end of the cylindrical portion 50 of the end cap 5 so as to position the second insulating sheet 9 at a specific position in the axial direction.

In the above-mentioned embodiment, each of the first insulating sheet 8 and the second insulating sheet 9 is formed of amide fibers and has a thickness of 0.25 mm or more, thereby exerting the following effects. Excellent withstand voltage characteristics (for example, a withstand voltage of 5000 V in the UL standard) can be obtained in the first insulating sheet 8 and the second insulating sheet 9 .

In the above embodiment, since the circuit board 7 includes the magnetic sensors 77A to 77C, and the magnetic sensors 77A to 77C are provided on the surface of the circuit board 7 on the stator 2 side, the following effects are exhibited. Compared with the case where the magnetic sensors 77A-77C are arranged on the side of the end cover 5 of the circuit board 7, the magnetic sensors 77A-77C can be placed closer to the rotor 3, so the detection accuracy of the magnetic sensors 77A-77C can be improved. In addition, when the first insulating sheet 8 is provided between the circuit board 7 and the stator 2 , the first insulating sheet 8 can be used to perform insulation between the coil 23 and the magnetic sensors 77A to 77C.

In the above-mentioned embodiment, the temperature sensor 6 is disposed on the end cover 5 side of the stator 2 and between the bent portions 24 a of the winding wires 24 in adjacent coils 23 . According to this structure, the temperature sensor 6 is arranged on the side of the end cover 5 of the stator 2, and between the bent portions 24a of the winding wires 24 of the adjacent coil 23, thereby detecting the most heat-generating bend in the rotating electrical machine 1. The temperature of part 24a. For example, based on the detection result of the temperature sensor 6 (the temperature of the bent portion 24 a of the winding 24 in the coil 23 of the rotating electrical machine 1 ), the driving of the rotating electrical machine 1 can be optimally operated. Therefore, the temperature sensor 6 is used, thereby suppressing an abnormality caused by heat generation of the rotary electric machine 1 .

In the above embodiment, the temperature sensor 6 is brought into contact with the bent portion 24 a of the winding wire 24 , so that the temperature of the bent portion 24 a of the winding wire 24 can be directly detected. Therefore, it is possible to detect the temperature of the bent portion 24 a most likely to generate heat in the rotary electric machine 1 with higher accuracy.

In the above-described embodiment, the first insulator 21 has the board-side abutting portion 82 abutting on the surface of the circuit board 7 on the stator 2 side, thereby exhibiting the following effects. The circuit board 7 can be separated from the coil 23 and supported at a specific position in the axial direction by the board-side abutting portion 82 . Specifically, by arranging the circuit board 7 at a distance from the coil 23 by the board-side abutting portion 82 , the circuit board 7 can be separated from the coil 23 as a heat source at a predetermined interval. Moreover, the magnet 31 of the rotor 3 can be set to the most appropriate position which can be detected by the three magnetic sensors 77A-77C.

In the above-described embodiment, the circuit board 7 has a plurality of engaging portions 72A to 72C arranged at predetermined intervals in the circumferential direction. The first insulator 21 has engaging portions 84A to 84C corresponding to each of the plurality of engaging portions 72A to 72C, respectively. Engaging the circuit board 7 with the first insulator 21 in a state where the engaging portions 84A- 84C of the first insulator 21 are inserted through the plurality of engaging portions 72A- 72C of the circuit board 7 produces the following effects. The circumferential and radial positions of the circuit board 7 can be defined by the plurality of engaging portions 84A to 84C, and the circuit board 7 can be held.

In the above-mentioned embodiment, the resin 90 is used to fill the gaps between the case 4 and the insulators 21 and 22 of the stator 2 arranged in the case 4, and between the plurality of protrusions 20b of the stator core 20, so that the case 4. The stator 2 and the temperature sensor 6 are integrated, thereby exerting the following effects. The thermal conductivity of the heat emitted from the coil 23 of the stator 2 is improved by using the resin 90 filled in the gap in the case 4, and the generated heat is dissipated from the entire case 4, thereby suppressing the temperature rise of the rotating electrical machine 1 (coils). 23 for warming). In addition, the contact state of the temperature sensor 6 to the coil 23 of the stator 2 is well maintained, and the detection accuracy of temperature is improved. Therefore, by using the temperature sensor 6 , it is possible to more effectively suppress an abnormality caused by heat generation of the rotary electric machine 1 (coil 23 ).

In the above-mentioned embodiment, the casing 4 is a bottomed cylindrical casing having a bottom 42 on the other side, and further includes the resin sheet 10 arranged between the bottom 42 and the stator 2, thereby exerting the following Effect. A resin sheet 10 with higher thermal conductivity than the resin is arranged between the bottom 42 of the housing 4 and the stator 2. When the bottom 42 of the housing 4 is installed on the mounting member 101, the heat generated from the coil 23 can be promoted to the mounting member. 101 conducts heat (dissipates heat), thereby suppressing the temperature rise of the rotating electrical machine 1 (coil 23). In addition, the insulation between the bottom 42 of the case 4 and the stator 2 arranged in the case 4 can be ensured by the resin sheet 10 .

In the above embodiment, the circuit board 7 has the resistor 75 for detecting the current supplied to the coil 23, and the resistor 75 is arranged on the surface of the circuit board 7 on the side of the end cap 5, thereby exerting the following effects. The circuit board 7 is interposed between the coil 23 which is a heat source and the resistor 75, whereby the resistor 75 is separated from the coil 23, thereby suppressing the resistor 75 from being affected by heat. Therefore, it is possible to suppress a decrease in detection accuracy of the current supplied to the coil 23 .

In the above embodiment, the circuit board 7 further has a plurality of FETs 76A to 76C and an encoder 78, and the encoder 78 is disposed on the leftmost first FET 76A among the plurality of FETs 76A to 76C and the resistor 75 in plan view. between, thereby exerting the following effects. Since a plurality of electronic components are mounted on the surface of the circuit board 7 on the side of the end cover 5, the arrangement space of each electronic component is limited, but the resistor 75, the encoder 78, and the plurality of FETs 76A to 76C can be appropriately arranged on the Limited space for the circuit board 7 .

[Second Embodiment] In the above-mentioned first embodiment, the case 4 has been described as an example in which the case 4 is a bottomed cylindrical case having the bottom 42 on the other side, but it is not limited thereto. For example, as shown in FIG. 11, the casing 204 may be a cylindrical casing. In Fig. 11, the same symbols are assigned to the same structures as those of the above-mentioned first embodiment, and detailed description thereof will be omitted.

As shown in FIG. 11, the rotating electrical machine 201 includes a cylindrical case 204; a front cover 215 mounted on the other side opening 245 of the cylindrical case 204; and a resin sheet 10 disposed on the front cover 215. between the stator 2.

The axial length of the cylindrical case 204 is larger than the bottomed cylindrical case 4 of the first embodiment described above (see FIG. 1 ). As shown in FIG. 12 , the cylindrical case 204 has a second step portion 246 at the other side in the axial direction. The second step portion 246 has: an annular surface 246a (hereinafter, also referred to as "second housing-side annular surface 246a"), which is annular when viewed from the axial direction; and a peripheral surface 246b (hereinafter, also referred to as It is referred to as “the second casing-side peripheral surface 246 b ”), which extends from the outer peripheral edge of the second casing-side annular surface 246 a to the other side in the axial direction. The axial length of the second case-side peripheral surface 246b is greater than the radial length of the second case-side annular surface 246a.

For example, the other side of the front cover 215 is attached to the attachment member 101 formed of a metal plate such as aluminum. The other side of the front cover 215 is the installation surface installed on the installation member 101 .

The front cover 215 is attached to the open end 245 on the other axial side of the cylindrical case 204 . For example, the front cover 215 is made of metal such as aluminum. The part of the front cover 215 on one side in the axial direction has: an annular surface 215a (hereinafter, also referred to as "front cover side annular surface 215a"), which is annular when viewed from the axial direction; and, a peripheral surface 215b (hereinafter, also referred to as "front cover side peripheral surface 215b"), which extends from the outer peripheral edge of the front cover side annular surface 215a to the other side in the axial direction.

The radial length of the front cover side annular surface 215a is larger than the radial length of the second housing side annular surface 246a. The axial length of the front cover side peripheral surface 215b is smaller than the axial length of the second housing side peripheral surface 246b. The axial length of the front cover side peripheral surface 215b is smaller than the radial length of the front cover side annular surface 215a.

The front cover 215 is fitted to the second step portion 246 of the cylindrical housing 204 by the outer peripheral portion of one axial side of the front cover 215 so as to be installed on the open end 245 of the other side of the cylindrical housing 204 . The front cover side peripheral surface 215b abuts against the second casing side peripheral surface 246b. The front cover-side annular surface 215a is separated from the second case-side annular surface 246a in the axial direction.

The resin sheet 10 is disposed between the front cover 215 and the stator 2 . The resin sheet 10 is arranged between the front cover 215 and the second insulator 22 . In the second embodiment, in order to suppress the misalignment of the resin sheet 10 , the bottom 216 of the front cover 215 is provided with an annular convex portion 217 which contacts the inner peripheral edge of the insertion hole of the resin sheet 10 . The axial height of the annular protrusion 217 is slightly larger than the thickness of the resin sheet 10 . For example, the inner diameter of the insertion hole of the resin sheet 10 is designed according to the outer diameter of the annular protrusion 217 . Furthermore, the structure for suppressing the displacement of the resin sheet 10 is not limited to providing the ring-shaped convex portion 217 . For example, instead of providing the annular protrusion 217 , the outer diameter of the resin sheet 10 may be made to match the inner diameter of the cylindrical case 204 . In the second embodiment, the axial position of the second insulator 22 is determined by abutting against the annular protrusion 217 . Thus, the resin sheet 10 is separated from the second insulator 22 in the axial direction. However, it is not limited thereto, and the resin sheet 10 can also contact the second insulator 22 .

In the second embodiment, the casing 204 is a cylindrical casing, and includes: a front cover 215 attached to the opening end 245 on the other side of the cylindrical casing 204; between the front cover 215 and the stator 2; thereby exerting the following effects. By disposing the resin sheet 10 with a higher thermal conductivity than the resin between the front cover 215 and the stator 2, when the front cover 215 is mounted on the mounting member 101, heat conduction (radiation) of the heat generated from the coil 23 to the mounting member 101 can be promoted. , and suppress the temperature rise of the rotating electric machine 201 (coil 23 ). In addition, the insulation between the front cover 215 and the stator 2 arranged in the case 204 can be ensured by the resin sheet 10 .

＜Changed example＞ In addition, the technical scope of this invention is not limited to the said embodiment, Various changes are possible in the range which does not deviate from the summary of this invention.

For example, in the first embodiment described above, the encoder 78 has been described as an example in which the encoder 78 is arranged between the leftmost first FET 76A and the resistor 75 among the plurality of FETs 76A to 76C in a plan view, but the present invention is not limited thereto. . For example, as shown in FIG. 13 , the resistor 75 may also be arranged between the leftmost first FET 76A and the encoder 78 among the plurality of FETs 76A to 76C in plan view of the circuit board 7A. That is, the resistor 75 is disposed between the first FET 76A and the encoder 78 in the circumferential direction. In this modified example, the resistor 75 is disposed on the side opposite to the third FET 76C across the shaft hole 71 in plan view. In this modified example, the encoder 78 is disposed on the side opposite to the second FET 76B across the shaft hole 71 in plan view.

In this modified example, the resistor 75 is disposed between the leftmost first FET 76A and the encoder 78 among the plurality of FETs 76A to 76C in a plan view, thereby exhibiting the following effects. Since a plurality of electronic components are mounted on the surface of the circuit board 7A on the side of the end cover 5, the arrangement space of each electronic component is limited, but the resistor 75, the encoder 78, and the plurality of FETs 76A to 76C can be appropriately arranged on the limited space for the circuit board 7A.

In the first embodiment described above, an example has been described in which the resistor 75 is disposed on the side opposite to the second FET 76B across the shaft hole 71 in plan view, but the present invention is not limited thereto. For example, as shown in FIG. 14 , when the circuit board 7B is viewed from above, the resistor 75 may be arranged on the side opposite to the first FET 76A via the shaft hole 71 . In this modified example, the encoder 78 is disposed on the side opposite to the second FET 76B across the shaft hole 71 in plan view.

In the example of FIG. 13 , the resistor 75 has been described as an example where the resistor 75 is disposed on the side opposite to the third FET 76C across the shaft hole 71 in plan view, but the present invention is not limited thereto. For example, as shown in FIG. 15 , the resistor 75 may be disposed on the side opposite to the second FET 76B via the shaft hole 71 in plan view of the circuit board 7C. In this modification example, the encoder 78 is arranged near the third FET 76C in plan view.

In the above-mentioned embodiment, the temperature sensor 6 has been described as an example in which the temperature sensor 6 abuts against the bent portion 24 a of the winding wire 24 , but the present invention is not limited thereto. For example, the temperature sensor 6 can also be separated from the bent portion 24 a of the winding wire 24 . For example, the temperature sensor 6 may be disposed near the bent portion 24 a of the winding wire 24 through the resin 90 . Thereby, the temperature of the bent portion 24 a of the winding wire 24 can be detected through the resin 90 .

In the above-mentioned embodiment, the driving of the rotary electric machine 1 (201) is controlled by including the circuit board 7, and the circuit board 7 is arranged on the inner side of the axially outer end of the case 4 (204), and is arranged between the stator 2 and the end. The cover 5 has been described as an example, but it is not limited thereto. For example, the circuit board 7 may also be disposed outside the axially outer end of the housing 4 ( 204 ).

In the above embodiment, the first insulator 21 has been described as an example in which the first insulator 21 has the board-side abutting portion 82 abutting on the surface of the circuit board 7 on the stator 2 side, but the present invention is not limited thereto. For example, the first insulator 21 may not have the substrate-side contact portion 82 . For example, the circuit board 7 may also be supported by other support portions different from the board-side contact portion 82 .

In the above-described embodiment, the circuit board 7 has a plurality of engaging portions 72A to 72C arranged at intervals in the circumferential direction, and the first insulator 21 has a structure for engaging with the circuit board 7 through each of the engaging portions 72A to 72C. The engaging parts 84A to 84C have been described as examples, but are not limited thereto. For example, the first insulator 21 may not have the engaging portions 84A to 84C. For example, the circuit board 7 may be engaged by other engaging portions different from the engaging portions 84A to 84C.

In the above-mentioned embodiment, the resin 90 is used to fill the gaps between the case 4 (204) and the insulators 21, 22, and between the plurality of protrusions 20b of the stator core 20, so that the case 4 (204), the stator 2 And the temperature sensor 6 is integrated as an example for description, but it is not limited thereto. For example, the resin 90 may not be filled in gaps between the case 4 and the insulators 21 and 22 and between the plurality of protrusions 20 b of the stator core 20 . For example, the casing 4 ( 204 ), the stator 2 and the temperature sensor 6 may also be integrated by other bonding members different from the resin 90 .

In the above-mentioned embodiment, the resin sheet 10 has been provided on the other side of the stator 2 in the axial direction and has been described as an example, but the present invention is not limited thereto. For example, the resin sheet 10 may not be provided on the other axial side of the stator 2 . For example, an insulating sheet such as insulating paper may be provided instead of the resin sheet 10 . For example, the structure to insulate the coil 23 can be changed according to required specifications.

In the above embodiment, the circuit board 7 has the resistor 75 for detecting the current supplied to the coil 23, and the resistor 75 is arranged on the surface of the circuit board 7 on the side of the end cover 5. However, the present invention is not limited thereto. . For example, the resistor 75 may be arranged on the surface of the circuit board 7 on the stator 2 side. For example, another substrate (such as a heat shield) different from the circuit substrate 7 may exist between the coil 23 as a heat source and the resistor 75 .

In the above embodiment, the rotating electrical machine 1 (201) is provided with the first insulating sheet 8 and the second insulating sheet 9, and the first insulating sheet 8 is disposed between the circuit board 7 and the stator 2 to insulate the circuit board 7 from the coil 23. Although the second insulating sheet 9 is disposed between the circuit board 7 and the end cover 5 to insulate the circuit board 7 and the end cover 5 as an example, it is not limited thereto. For example, the rotating electrical machine 1 ( 201 ) may be provided with components capable of obtaining the same effect instead of the first insulating sheet 8 and the second insulating sheet 9 . For example, the rotating electrical machine 1 ( 201 ) may include a resin sheet instead of each of the first insulating sheet 8 and the second insulating sheet 9 . For example, the structure to insulate the circuit board 7 from the coil 23 and the structure to insulate the circuit board 7 from the end cover 5 can also be changed according to required specifications.

In the above-mentioned embodiment, the LOI value of each of the first insulating sheet 8 and the second insulating sheet 9 in an environment of 220° C. is higher than 20.8% for description, but the present invention is not limited thereto. For example, the LOI value of each of the first insulating sheet 8 and the second insulating sheet 9 in an environment of 220° C. may be 20.8% or less.

In the above embodiment, the first insulator 21 has been described as an example having the sheet-side abutting portion 81 abutting on the surface of the first insulating sheet 8 on the stator 2 side, but the present invention is not limited thereto. For example, the first insulator 21 may not have the sheet-side abutting portion 81 . For example, the first insulating sheet 8 may also be supported by other support portions different from the sheet-side abutting portion 81 .

In the above embodiment, the second insulating sheet 9 is sandwiched between the opening on one side of the case 4 ( 204 ) and the front end of the cylindrical portion 50 of the end cap 5 as an example, but the present invention is not limited thereto. For example, the second insulating sheet 9 may be supported by another supporting portion different from the opening portion on one side of the case 4 ( 204 ) and the front end of the cylindrical portion 50 of the end cap 5 .

In the above embodiment, the first insulating sheet 8 and the second insulating sheet 9 are described as examples where each is formed of amide fiber and has a thickness of 0.25 mm or more, but the present invention is not limited thereto. For example, the respective raw materials and thicknesses of the first insulating sheet 8 and the second insulating sheet 9 can be changed according to required specifications.

In the above-mentioned embodiment, an example in which only one temperature sensor 6 is provided has been described, but it is not limited thereto. For example, a plurality of temperature sensors 6 may also be provided. For example, the number of installed temperature sensors 6 can be changed according to required specifications.

In the above-mentioned embodiment, the circuit board 7 has been described as an example in which one resistor 75 , three FETs 76A to 76C, and three magnetic sensors 77A to 77C are provided, but the present invention is not limited thereto. For example, a plurality of resistors 75 may be provided. For example, the number of FETs 76A to 76C other than three may also be provided. For example, the number of magnetic sensors 77A-77C other than three may also be provided. For example, the number of resistors 75 , FETs 76A to 76C, magnetic sensors 77A to 77C, and encoders 78 can be changed according to required specifications.

In addition, the constituent elements in the above-described embodiments may be replaced with known components within a range not departing from the spirit of the present invention. In addition, each of the above-mentioned modification examples may be combined.

1,201: rotating electrical machines 2: Stator 3: rotor 4: bottomed cylindrical shell (shell) 5: End cap 6: Temperature sensor 7, 7A, 7B, 7C: circuit board 8: The first insulating sheet 9: Second insulating sheet 10: resin sheet 11: axis 12: Bearing 20: Stator core 20a: core body 20b: protrusion 20c: protruding end 20d: Protruding flange part 21: The first insulator (insulator) 22: Second insulator (insulator) 23: Coil 23U: U phase coil 23V:V phase coil 23W:W phase coil 24: Winding 24a: bending part 25A～25C: lead wire 26A～26C: area 30: Yoke 31: magnet 40: shell barrel 41,245: Open end 42,216: Bottom 43: step department 43a: Shell side annular surface 43b: Shell side peripheral surface 44,217: ring convex part 50:Cylinder part of outer cover 51: Cover 52: convex part 52a: Annular surface on the outer cover side 52b: side surface of outer cover 60:lead 70: Substrate body 71: shaft hole 72A～72C, 84A～84C: engaging part 73: Connection hole 74A～74C: incision 75: Resistor 76A～76C: FET 77A: The first magnetic sensor (magnetic sensor) 77B: Second magnetic sensor (magnetic sensor) 77C: The third magnetic sensor (magnetic sensor) 78: Encoder 79:Electronic parts 80: annular part 81: Sheet side contact part (contact part) 82: Substrate side contact part (contact part) 83: Extension 90: Resin 91: space (internal space of the stator) 100: cable 101: Install components 102: IC for motor controller 204: Cylindrical shell (shell) 215: front cover 215a: Front cover side annular surface 215b: side surface of front cover 246: The second stage 246a: second shell side annular surface 246b: the side peripheral surface of the second housing 1001: Wiring department II, XII: circled part CL: axis

Fig. 1 is a sectional view including an axis line of a rotating electrical machine according to a first embodiment. Figure 2 is an enlarged view of the portion circled by II in Figure 1 . Fig. 3 is a view of the rotating electrical machine according to the first embodiment viewed from one side in the axial direction. Fig. 4 is a view of the rotating electric machine according to the first embodiment viewed from the radially outer side. Fig. 5 is a perspective view of the rotating electrical machine according to the first embodiment viewed from the circuit board side. Fig. 6 is a perspective view of the rotating electrical machine according to the first embodiment viewed from the first insulator side. FIG. 7A is a plan view of the circuit board of the first embodiment viewed from one side in the axial direction. FIG. 7B is a plan view of the circuit board according to the first embodiment viewed from the other side in the axial direction (a plan view of the surface opposite to FIG. 7A ). Fig. 8 is an explanatory diagram related to the arrangement of resistors and the like in the first embodiment. Fig. 9 is a view of the stator core according to the first embodiment viewed from the axial direction. Fig. 10 is an explanatory diagram related to the resin filling structure in the casing according to the first embodiment. Fig. 11 is a cross-sectional view of the rotating electric machine according to the second embodiment, which corresponds to Fig. 1 . Figure 12 is an enlarged view of the portion circled by XII in Figure 11. FIG. 13 shows the arrangement of resistors and the like related to the first modification, which corresponds to FIG. 8 . FIG. 14 shows the arrangement of resistors and the like related to the second modification, which corresponds to FIG. 8 . FIG. 15 shows the arrangement of resistors and the like related to the third modification example, which corresponds to FIG. 8 .

Domestic deposit information (please note in order of depositor, date, and number) none Overseas storage information (please note in order of storage country, institution, date, and number) none

1: rotating motor

2: Stator

3: rotor

4: bottomed cylindrical shell (shell)

5: End cap

7: Circuit board

8: The first insulating sheet

9: Second insulating sheet

10: resin sheet

11: axis

12: Bearing

20: Stator core

21: The first insulator (insulator)

22: Second insulator (insulator)

23: Coil

24: Winding

30: Yoke

31: magnet

40: shell barrel

41: Open end

42: bottom

44: Annular convex part

50:Cylinder part of outer cover

51: Cover

80: annular part

81: sheet side abutment portion (abutment portion)

82: Substrate side contact part (contact part)

83: Extension

84A:Catching part

91: Space (internal space of the stator)

100: cable

101: Install components

II: circled part

CL: axis

Claims (7)

A rotating electric machine, characterized by comprising: a cylindrical stator; a rotor disposed in the inner space of the stator; a cylindrical or bottomed cylindrical housing for accommodating the stator; and a metal end cover for Installed at the opening end of one side of the case; and, a circuit board, which controls the driving of the rotating electric machine; and, the stator is provided with: a stator core having a plurality of protrusions protruding toward the center of the stator; an insulator, which mounted on the stator core; and, a coil formed by winding a wire to each of the plurality of protrusions via the insulator; Closer to the inner side, and arranged between the stator and the end cover, the rotating electrical machine further includes: a first insulating sheet arranged between the stator and the circuit substrate to insulate the circuit substrate from the coil; and, The second insulating sheet is arranged between the circuit substrate and the end cover to insulate the circuit substrate and the end cover. The rotating electric machine according to claim 1, wherein each of the first insulating sheet and the second insulating sheet has an LOI value higher than 20.8% in an environment of 220°C. The rotating electric machine according to claim 1 or 2, wherein, The housing and the stator are integrated by filling the gaps between the housing and the insulator and between each of the plurality of protrusions of the stator core with resin. The rotating electric machine according to claim 1 or 2, wherein the insulator has an abutment portion for abutting against the surface of the first insulating sheet on the stator side. The rotating electrical machine according to claim 1 or 2, wherein the second insulating sheet is sandwiched between an opening portion on one side of the housing and a front end of the cylindrical portion of the end cap. The rotating electric machine according to claim 1 or 2, wherein the first insulating sheet and the second insulating sheet are each formed of amide fibers and have a thickness of 0.25 mm or more. The rotating electric machine according to claim 1 or 2, wherein the circuit board includes a magnetic sensor provided on a surface of the circuit board on the stator side.

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